<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.global.js"></script>
</head>

<body>
    <div id="app">
        <alert-box>
            <h1>Something bad happened.</h1>
            <h6 style="fontSize:1px">我很菜很卑微</h6>
          </alert-box>
    </div>

    <script>
        const app = Vue.createApp({})

        app.component('alert-box', {
            template: `
                <div class="demo-alert-box">
                <strong>Error!</strong>
                <slot></slot>
                </div>
            `
        })

        app.mount("#app")
    </script>
</body>

</html>